CVE-2026-70339Network attack vector

Remote code execution via type confusion

Published Aug 11, 2026 · Updated Aug 25, 2026

Type confusion in Microsoft Edge (Chromium-based) before 151.0.4129.78 allows remote attackers to execute code via crafted web content. Microsoft describes the flaw only as access of a resource using an incompatible type and has not disclosed the affected Edge component or the invalid cast or object handling that triggers the confusion. Exploitation is client-side rather than a server compromise path: opening attacker-supplied content is required, and published scoring shows confidentiality and integrity impact without a listed availability effect.

CVSS severity5.4
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Microsoft Edge (Chromium-based) before 151.0.4129.78 allows remote attackers to execute code via crafted web content. Microsoft describes the flaw only as access of a resource using an incompatible type and has not disclosed the affected Edge component or the invalid cast or object handling that triggers the confusion. Exploitation is client-side rather than a server compromise path: opening attacker-supplied content is required, and published scoring shows confidentiality and integrity impact without a listed availability effect.

The record

CVE
CVE-2026-70339
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-843, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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